Build up in washing machine

[paulmccartneysbagel]

I've noticed there is a build up in my washing machine. I guess it's soap scum? I live in a VERY hard water area and have been using soda crystals.

Tried cleaning the machine with a cleaner, and with vinegar, on a 90 degree wash. But I'm thinking it will need elbow grease. Any recommendations of what I can do to remove it?

I'm guessing that's limescale? Citric acid is my go-to but it needs to 'soak' a bit to dissolve the limescale. Maybe the black Harpic?

I do have some of that so may try a small area and see if it works! Thanks

It's sparkling now. Tried a few descalers but the one that worked best was the Wilko washing machine cleaner 👍🏻 just in case this helps anyone in the future!